I was about to post the same; they adopted the pass/fail first semester policy in 1971.

But then I was just horrified to read apparently they got rid of that system in 2017 [1], and now it's a normal letter grade?! Assuming that Hopkins still skews quite harshly on grading, that's an awful regression.

[1] https://www.jhunewsletter.com/article/2016/05/university-to-...